Merge pull request #9 from crystal-community/0.5.0-release

tick version to 0.5.0

Bump v0.4.1

Merge pull request #2 from Sija/crystal-0.33.0

Refactors and support for Crystal 0.33.0

version tick 0.3 for crystal 0.29

tick to version 0.2.0

Update readme